Boiler construction



Oct. 15, 1929. WELTER 1,731,957

BOILER CONSTRUCTION Filed June 28, 1926 2 Sheets-Sheet 1 IN V EN TOR.

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Oct. 15, 1929. G. WELTER BOILER CONSTRUCTION 2 Sheets-Sheet 2 Filed June 28, 1926 IN V EN TOR.

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Patented Oct. 15, W39

UNIT D STATES PATENT flt l ttl i1 GUSTAVE VV'ELTER, OF NEW HAVEN, CUNINECTTBUT, ASEETG'NUR TO THE Bite-F .LUW' Ctllllb PANY, OF NEW HAVEN, CONNECTICUT, A GUTtPUTtATTOlII' OF GUNNIECTIGUT BOILER CUNSTRUCTION Application filed June 28,

This invention relates to an improved boiler construction. Its particular purpose is to provide a new and useful arrangement in a type of water tube boiler widely used in industry and known as the Bigelow- Hornsby boiler. The Roberts latent #725,875 granted April-21, 1903, discloses the prior art arrangement of independent water tube units connected together and with a steam drum for an ordinary operation in this type of boiler.

My improvement is made in the provision of means to permit the location of the steam drum above the water level in the upper drums of the independent water tube units and maintain such Water level uniform in all the upper drums of such water tube units without the aid of the steam drum. This means will be best understood from the aet companying drawings and following de.

script-ion.

In the drawings:

Fig. 1 is a sectional elevation of a boiler made according to the invention.

Fig. 2 is a top plan view of the same boiler with the roof removed to show the arrangement of the steam drum with the water tube units.

The boiler setting a, the means of firing and passing the gases across the water tubes b from the front of the boiler A to the flue B is so well known as to need no description herein. The feed water may be supplied to the lower drums of the rear row of water tube units by branch pipes 0 from feed line 65'.

As indicated in the drawings each water tube unit is composed of a nest of water tubes 6 joined at the bottom to a drum 6 and at the top to a drum These water tube units are arranged in transverse rows across the furnace, there being sir: such rows shown. The steam is formed in the rows toward the front. The water heated in the rear rows feeds forwardly through suitable nipple con nections 9 between the drums. The sediment is blown off through branch pipes 7t and valve 27. All this is of usual construction.

As the hot gases pass from A to B they must scrub all the water tubes. But there is a distinct tendency during the rapid formaeee. Serial No. 119,048.

tion of steam in the front rows of independent water tube units for the water level in some of the units to differ from that in others across the rows. This is probably due to the gases passing through one region of the furnace being hotter than those passing through other regions. In any event it is important to keep the water level across the independent units the same or there will be a distinct loss in boiler eiiiciency, and the gases will not give up their heat uniformly across the boiler.

Heretofore, and as shown in the Roberts patent, the importance of keeping the water level the same in independent units across the front rows in the boiler has been recognized. It has been accomplished by providing a wet steam drum located so that it provides one volume of water supply from the drum aranged transversely of the furnace and fed from the drum forwardly into the upper drums of the forward water tube units.

But it is desirable for many reasons to have the steam drum dry and to maintain the water level in the independent units in the front rows without utilizing the steam drum for the purpose.

I have shown my steam drum 1 with outlet 5 located entirely above the normal water level of the tube unit drums. The upper portions of the latter where the steam collects are connected directly to the steam drum by pipes 2 where the tube unit drums are adjacent and such drums are likewise counected to those immediately in front by nipples 9 where they are not adjacent the steam drum. Therefore, the steainhas direct and short front to rear access between the steaming units and the steam drum.

The steam forms more rapidly in the front rows of tube units for example in the two front rows of Fig. 1 were the gases are hot test and where the radiant heat is acting with the units tipped forwardly to increase such action. In the given example the water level would have a definite tendency to vary in the respective transverse tube units in the two front rows. This tendency would be present but to a much less degree in the units of the two rows back of the steam drum.

Thespecial means for insuring the proper water level in the independent tube units of level in such drums. Then the second top drum of the thirdrowhas three like pipe connections, except thatone goes to the top druni of the second row immediately in front and one to the left and one to the right hand drum of the second row. The third to the eleventh top drums inclusive of the third row are connected to the drums of the second row in the identical manner to that described with re gard to the second drum of the third row.

, The right hand drum of the third row is con- 'nected like the left hand drum to the second row already described except that the connection is from right to left instead of from left toright. These connect ons 3 are shown in Fig. 2 and may be easily followed thereon. As seen in Fig. 1 the connections 3 lie below *the wall 4 limiting the gas pass so that it does not reach the steam drum. The water level in the front row of drums is readily equalized with that in the second row by short nipples 9' connecting each front and rear pair of water drums.

Looking again at Fig. 2 it is clear that by my arrangement the water level of thethird row of units will readily maintain a like water level in the two front rows of units because of the provision for the flow transversely of the rows. Any tendency for the water level to fall say in the right hand region of the boiler will be immediately checked by a water flow from the left hand units.

There is an advantage in having the steam drum dry and in using the independent water tube units particularly in large high pressure boilers. In such boilers it is of great importance to maintain a uniform water level "across the boiler which the independent units tend to disturb. By the provision. of the means described all the desired purposes are accomplished in a useful and economical manner without using the steam drum or its equivalent for the purpose. This new means can be adapted in various ways to the Bige- -low-Hornsby type of boiler without losing its identity within the scope 'of the annexed claims.

I claim:

1. In a boiler of the type described, a series of transverse rows of independent water tube units, each unit having upper individual tube unitdruins. the units of each row being aligned longitudinally with the units of each other row,,a steam drum located above the water level in said drums and connected thereto, and means comprising pipe connections below the normal water level in said drums andlbetwee'n each individual tube unit drum of the units of one row and a plurality of individual tube unit drums of the units in front of said row to maintain a uniform water level in said independent units.

2. In a boiler of the type described, a series of transverse rows of independent water tube units, each unit having individual upper tube unit drums, the units of each row being aligned longitudinally with the units of each other row, a steam drum located above the water level in said drums and connected thereto, and means including three pipe connections below the normal water level in said drums and extending from each upper iiidividual tube unit drum of the units of one row to the upper individual tube unit drums of the units in front of said row,one of said pipes connected to the tube unit drum directly in front and the others directly connected to the individual tube unit drums on each side thereof except at the ends of the rows, all constructed and arranged to maintain a uniform water level in said dependent units. I a

y In testimony whereof I have afiixed my signature.

GUSTAVE VELTER. 

